add __styles to Element prototype

Author: adiguba

packages/svelte/src/internal/client/dom/operations.js

@@ -44,6 +44,8 @@ export function init_operations() {
 	// @ts-expect-error
 	element_prototype.__attributes = null;
 	// @ts-expect-error
+	element_prototype.__styles = null;
+	// @ts-expect-error
 	element_prototype.__e = undefined;
 
 	// @ts-expect-error